Otter Creek Labs OTB Muzzle Brake Features The Otter Creek Labs OTB Muzzle Brake is machined from H900 heat treated 17-4 steel giving it the strength to serve as both a muzzle brake and a mounting interface for the OPS 12th model OCM5 or AEM5 suppressor mounts. It threads onto any barrel with 5/8x24 threads provided the barrel does not exceed .75 inch outer diameter and offers at least 2.05 inches of exposed barrel from the shoulder. This design removes the need for custom collars or specialized barrel work letting the brake install directly on a properly spec d barrel. The black nitride finish adds corrosion resistance and a durable surface for long term use. Timing the brake correctly is critical and the included shim kit is the only approved method for doing so which is part of why this brake costs more than Otter Creek Labs fixed hole version. Users are cautioned not to use a crush washer with this muzzle device as doing so voids the warranty. Once properly timed and installed the brake functions as a reliable no-fuss mounting point for compatible Otter Creek Labs suppressor mounts. For shooters already running or planning to run an OPS 12 OCM5 or AEM5 mount this muzzle brake is a purpose built solution that avoids custom machining. Otter Creek Labs OTB Muzzle Brake Specifications Manufacturer: Otter Creek Labs Model: OTB Muzzle Brake Color: Black Finish: Black Nitride Material: Steel Thread Pattern: 5/8x24 Country Of Origin: USA Available At: GrabAGun